A transforming device includes: a body; a movable element movable between a storage position and a separate position, wherein the movable element is accommodated in the body when the movable element is disposed at the storage position, and wherein the movable element is separated from the body when the movable element is disposed at the separate position; a pushing element for pushing the movable element from the storage position to the separate position; and a pair of magnets. One magnet is disposed in the body, and the other magnet is disposed in the movable element. The pair of magnets generates auxiliary force for pushing the movable element from the storage position to the separate position.